Improving inverter welding

Symptom:

It does not turn on, does not do anything, only the fan goes.

The control electronics have a separate switching power supply that is broken.

Fuse blown, drive transistor shorted etc.

Disassembly is not too complicated, but there are many screws ...

Power supply and power supply panel disconnected.

The end point is not short.

Controller transistor replaced but afterwards it is gone again ...

The switch transformer was unfortunately short-circuited ...

This is mostly an irreparable mistake, but I've been exceptionally bothered and

I unpacked the old wire and wrote thread numbers, diameters, and so on.

After the wires have been wound, they have been manually wound and have been flawless since then.

The end result was new silicon grease and I returned it to the owner after testing.

(He was my former boss).